Light bulb



FIG. 1 is a perspective view of a light bulb;

FIG. 2 is another perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a left side elevational view thereof;

FIG. 6 is a right side elevational view thereof;

FIG. 7 is a top plan view thereof;

FIG. 8 is a bottom plan view thereof; and,

FIG. 9 is an exploded perspective view of the light bulb.

The broken lines in the drawings depict portions of the light bulb that form no part of the claimed design. 

CLAIM The ornamental design for a light bulb, as shown and described. 